Which of the following is NOT traditionally considered one of the three primary postmortem interval indicators (Rigor Mortis, Livor Mortis, Algor Mortis)?

• A. Rigor Mortis
• B. Livor Mortis
• C. Algor Mortis
• D. Entomology

Answer: (D)

The key idea is separating the direct, observable postmortem changes from a supplementary method used to estimate time since death. The three classic postmortem interval indicators are observable changes in the body: cooling of the body (algor mortis), the body’s gradual stiffening (rigor mortis), and the discoloration from blood settling in dependent areas (livor mortis). These are immediate, physiological signs that help narrow down the time since death in the early stages.

Entomology, on the other hand, uses the developmental stages of insects that colonize a body to estimate PMI. It’s a powerful tool, especially when decomposition has progressed too far for the physical signs to be reliable, but it is not one of the primary physiological indicators. So, entomology is the method that doesn’t belong to the traditional trio of postmortem signs.